LAW OF THE WILD - A 12 episode serial starring Rex, a wild stallion, and Rinty (Rin-Tin-Tin, Jr), a police dog. Their master, John Sheldon (Bob Custer) is framed for murder, and Alice Ingram (Lucille Browne) plans to race Rex for money to pay for John's legal defence. Meanwhile, Frank Nolan (Richard Cramer), who has falsely accused John, sets out to steal Rex for himself.
THE LONE DEFENDER - Rin-Tin-Tin is back in this 12 episode serial! A prospector is murdered by The Cactus Kid and his gang, who hope to find the murdered man's goldmine. The miner's dog, Rinty (Rin-Tin-Tin), recognizes the killers, who thereafter seek to use the dog to locate the lost mine. With the help of a government agent and a young girl, Rinty saves the mine and brings the bad guys to justice.
FANGS OF THE WILD - When a gang of criminals begin to use a Rin-Tin-Tin look-alike to steal valuable pelts from a fox farm, Agent Don Brady (Dennis Moore) and his trusty canine companion (Rin-Tin-Tin) are called in to go undercover and track down the baddies.
THE ADVENTURES OF REX AND RINTY - A 12 episode serial starring Rex, the King of the Wild Horses and Rin-Tin-Tin, Jr. Rex, a beautiful black stallion revered as a deity on the exotic island of Sujan, is kidnapped and brought to the U.S. to be trained as a polo pony. He escapes and meets Rinty who helps him evade recapture as rival factions search for him.
LAW OF THE WOLF - Carl Pearson (Dennis Moore), having been wrongly convicted of killing his brother, breaks out of prison and goes on the run. Determined to clear his name and get revenge against the man who killed his brother and framed him for the murder, Roger Morgan (Robert Frazer), he encounters a brilliant police dog who helps him in his hunt for justice.